Observable SpecApi objects lose their attributes – eg, in ecdfplot

[aplavin]

Noticed a regression in a recent version, related to observable specapi objects. Specifically, they seem to lose their attributes.
MWE:

using GLMakie
x = Observable([1,2,3])
ecdfplot(x, linewidth=10)

shows (correct)

But then, updating x resets attributes to defaults:

x[] = [1,2,3]

• what version of Makie are you running? (]st -m Makie) v0.21.18
• can you reproduce the bug with a fresh environment ? (]activate --temp; add Makie) yes
• What platform + GPU are you on? any

[asinghvi17]

Ah, it looks like this problem is actually twofold: setting ecdfplot_obj.linewidth after plotting does not change the displayed linewidth either. Maybe it's a problem with convert_arguments not catching the updated attribute from the kwargs?

Here's an interactive example in the REPL that shows what's going wrong:

julia> f, a, p = ecdfplot(x, linewidth=10)

julia> p.linewidth[]
10

julia> p.plots[1].linewidth[]
10

julia> # now, this does not work:

julia> p.linewidth[] = 15
15

julia> # but this does

julia> p.plots[1].linewidth[] = 15
15

julia> # now we can also try to change the data:

julia> x[] = rand(1:5, 3)
3-element Vector{Int64}:
 2
 3
 4

julia> p.linewidth[]
15

julia> p.plots[1].linewidth[]
1.5